Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
  • G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
  • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
  • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
  • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
  • F16C19/361—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with cylindrical rollers
  • F16C19/362—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with cylindrical rollers the rollers being crossed within the single row
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
  • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
  • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
  • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/30—Parts of ball or roller bearings
  • F16C33/58—Raceways; Race rings
  • F16C33/583—Details of specific parts of races
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/30—Parts of ball or roller bearings
  • F16C33/58—Raceways; Race rings
  • F16C33/583—Details of specific parts of races
  • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
  • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
  • G01D5/2451—Incremental encoders
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
  • G01P3/446—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings mounted between two axially spaced rows of rolling elements
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
  • G01P3/42—Devices characterised by the use of electric or magnetic means
  • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
  • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
  • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
  • G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2300/00—Application independent of particular apparatuses
  • F16C2300/10—Application independent of particular apparatuses related to size
  • F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49826—Assembling or joining

Definitions

• the invention relates to an angle measuring system according to claim 1, and a method for producing a corresponding angle measuring system according to claim 10.
• Such angle measuring systems are used to measure rotational movements or rotational positions of a machine part, such as a shaft.
• the rotational movement is detected either incremental or absolute, the output measured value is z.
• B. a sequence of counts, a counter value or a code word.
• Corresponding angle measuring systems are used in particular in so-called pick-and-place machines in the manufacture of electronic components, or used in machine tools for the measurement of rotational movements.
• the reproducibility or repeatability of the rotational angles of machine parts to just a few angular seconds is very important for pick-and-place machines, for example.
• the absolute accuracy of the measurement results of an angle measuring system is crucial. They are wind kelmesssysteme known which have their own storage of relatively rotatable components.
• the accuracy of an angle measurement is significantly influenced by the quality of the angular scaling, their eccentricity and by the concentricity deviations of the bearing or wobble error.
• Laid-open specification DE 30 36 005 A1 discloses a method for producing an angle scaling for an angle measuring system, in which code tracks are applied to a code disk by a laser beam.
• the code disk is already connected to a shaft during writing, so that the code disk is already centered relative to the shaft when writing the code pattern.
• the invention has for its object to provide a robust angle measuring system and a method for its production, which is particularly characterized by the fact that a very accurate compact angle measuring system can be realized in a simple design.
• the angle measuring system comprises a first component group, a second component group and a sensor, wherein the first component group is rotatably mounted relative to the second component group about an axis.
• the first component group has a ring with a tread and with an angle scaling.
• the second component group has a further ring with a further tread and the sensor for scanning the angle scaling.
• Rolling elements are arranged between the running surfaces of the first and the second component group.
• the angle scaling is applied in such a way that a geometric pattern of the angle scaling in a first range of a geometric pattern of the angle scaling in deviates a second range depending on concentricity deviations of the running surfaces and / or the rolling elements.
• the geometric patterns of the angle scaling of the angle measuring system are therefore dependent, inter alia, on the individual dimensions or dimensional deviations of the respective running surfaces present in the angle measuring system and / or the rolling bodies.
• the angle scaling is applied to a component of the first component group, it being possible for the component to be non-rotatably connected to the ring as a separate component, for example as a dividing ring, or it may be configured as an integral component of the ring of the first component group. The latter applies approximately when the angle scaling is applied directly to the ring.
• the ring of the second component group has a radially continuous opening through which the angle scaling can be applied.
• the opening may be designed such that it has an axial extent which is less than 1/3, in particular less than 1/5, of the axial outer dimension of the ring of the second component group.
• the running surfaces are those surfaces or webs along which the rolling elements roll during operation of the angle measuring system.
• the running surfaces of the ring of the first group of components may be convex from an axially parallel view, while the running surfaces of the ring of the second group of components may be concave.
• the ring of the first group of components lies radially inward and can then also be referred to as an inner ring, while the ring of the second group of components is in this case arranged radially outward and can be defined as an outer ring.
• the angle scaling is arranged on a shell side of the dividing ring.
• shell side is to be understood as a cylindrical surface or circumferential surface which is closed either by 360 ° - A -
• angle scaling can then be aligned with a directional component parallel to the axis.
• the angle scaling consists of areas of different magnetic polarization. In this case, then the magnetized areas are aligned with a direction component parallel to the axis, so that virtually alternate as magnetic graduation lines in the circumferential direction north and south poles.
• the angle scaling can also consist of several tracks, for example if the absolute angular position of a shaft to be measured is to be able to be determined directly from the angle scaling.
• the angle scaling can also be aligned with a radial directional component.
• at least part of the angular scaling is applied to the front side of the relevant component of the first component group.
• the angle scaling on a component, in particular a dividing ring, the first component group is applied, which consists of a magnetizable material.
• the dividing ring may consist of a hard magnetic material having a coercive force of at least 1 kA / m.
• the coercive force is between 10 kA / m and 60 kA / m, in particular between 25 kA / m and 45 kA / m.
• an MR sensor or a Hall sensor can be used as a sensor.
• a Hall sensor for example, an MR sensor or a Hall sensor can be used.
• Particularly good measuring accuracies of the angle measuring system are achieved when the first group of components and the second group of components, and the rolling elements are designed so that the first group of components and the second group of components are arranged axially and / or radially backlash to each other.
• the first and the second component group each have two treads between which rolling elements are arranged.
• the Angle scaling and the opening through which the angle scaling can be applied can then be arranged axially between these running surfaces.
• the ring of the second component group is made massive and has circumferentially offset from the opening a first recess for receiving a printed circuit board with an electronic circuit.
• the angle measuring system is designed so that its maximum axial extent is less than 40%, in particular less than 30% of the maximum outer radius of the angle measuring system. Furthermore, it is advantageous if the angle measuring system has a relatively large opening for receiving a shaft to be measured, wherein the radius of the opening is advantageously at least 50%, in particular at least 60% of the maximum outer radius of the angle measuring system. This opening is limited, for example, by the inner diameter of the inner ring, while then the outer radius of the outer ring represents the outer radius of the angle measuring system.
• the object is achieved by a method according to claim 10.
• the rings of the two component groups are first produced in a method step, with at least one finely processed running surface being produced on each of them.
• This is followed by assembling the angle measuring system in such a way that the running surface of the first ring is opposite the running surface of the second ring and the rolling elements are arranged between the two running surfaces, in such a way that the first group of components and the second group of components are arranged axially backlash relative to one another.
• the rings are fixed to relatively rotatable elements - such as a stator block and a shaft - a division machine.
• the angle scaling is applied to a component of the first component group, wherein in this step the rings in the division machine are rotated about the axis relative to one another.
• a, in particular radially oriented, opening is incorporated in the ring of the second component group. The application of the angle scaling on the relevant component of the first component group is then carried out using the opening.
• the angle scaling can be such that only incremental angular position information can be read out by it, or also, in addition or alternatively, absolute angular positions.
• a magnetic write head is introduced into the opening and the angle scaling is applied.
• the component of the first group of components, to which the angle scaling is applied from a hard magnetic material.
• the component in particular a dividing ring, of the first group of components, to which the angle scaling is later applied, can be mounted on the ring of the first group of components during assembly, ie before application of the angle scaling.
• the component can be mounted on the outer circumference of the ring.
• the treads are advantageously processed by means of a grinding, honing or lapping process.
• an axial and / or radial prestress is produced between the rings.
• the angle measuring system comprises a first component group and a second component group, wherein the first component group is rotatably mounted about an axis relative to the second component group. Furthermore, the first component group has a ring with a running surface and an angle scaling.
• the second component group has a sensor for scanning the angle scaling and a printed circuit board with an electronic circuit for evaluation by the scan can be generated signals of the sensor.
• the second component group also includes a solid ring on which a further tread is arranged and has a first recess for receiving the circuit board. Furthermore, the second component group for receiving an electrical conductor has a second recess. The electrical conductor is spaced from the sensor and electrically connects the sensor to the electronic circuit.
• an extension of the first recess of the ring of the second component group in a direction parallel to the axis is greater than an extension of the first recess in the circumferential direction.
• the greatest extent of the first recess in a direction parallel to the axis is greater than the largest extent of the first recess in the circumferential direction.
• the ring of the second component group has an axial external dimension, which is advantageously at least 1.5 times as large as the extent of the first recess of the ring of the second component group in a direction parallel to the axis.
• the axial outer dimension of the respective ring may be at least 1.75 times or at least twice as large as the extent of the first recess of the ring of the second component group in a direction parallel to the axis.
• the ring of the second component group has a third recess for receiving the sensor.
• the sensor may be mounted to the second group of components prior to assembly - especially only prior to assembly - of the first group of components, the second group of components, and the rolling elements.
• the electrical conductor may also be mounted on the second component group before assembling the first component group, the second component group and the rolling elements.
• the ring of the second component group is advantageously designed as a metallic ring, in particular as a steel ring.
• the extent of the first recess is greater than the extent of the second recess, in each case based on a direction parallel to the axis. This applies in particular to the respective largest extensions of the second recess.
• the electrical conductor may have a cross section with different external dimensions, for example a rectangular cross section, which naturally has two different edge lengths as respective external dimensions.
• the larger external dimension is arranged in a direction parallel to the axis. The same consideration can for example be applied to conductors with elliptical cross-section.
• the first recess may be configured so that the circuit board in the radial direction, in particular in a direction towards the axis, can be inserted into the first recess.
• the first recess then has an opening on the outer circumference of the ring of the second component group.
• the third recess may be configured so that the sensor can be introduced in a direction away from the axis, radially outwardly into the third recess. Accordingly, the third recess may then have an opening on the inner circumference of the ring of the second component group.
• FIG. 1 shows a partial sectional view through an angle measuring system
• FIG. 2 shows a partial plan view of a ring of the angle measuring system with an angle scaling
• FIG. 3 is a sectional view through the angle measuring system
• FIG. 4 a shows a plan view of a part of the angle measuring system
• Figure 4b is a side view of a portion of the angle measuring system.
• the angle measuring system comprises a first component group 1 and a second component group 2, the first component group 1 serving as a rotor and the second component group 2 as a stator in the exemplary embodiment presented.
• the first component group 1 comprises a ring, which is referred to in the present embodiment as an inner ring 1.1. Accordingly, another ring, which is assigned to the second component group 2, named here as outer ring 2.1.
• the inner ring 1.1 and the outer ring 2.1 are first produced.
• the contours are initially machined out in a comparatively coarse chip removal manner.
• the axial outer dimension Z (see FIG. 4 b) of the outer ring 2. 1 is 70 mm in the present exemplary embodiment.
• a radially aligned opening 2.15 here in the form of a cylindrical bore, incorporated.
• a cavity is incorporated in the outer ring 2.1, the three chambers, or three recesses 2.1 1, 2.12. 2.13 includes.
• the radially outermost recess 2.11 has the largest volume.
• the further inner recess 2.12 connects the two adjacent recesses 2.11 and 2.13.
• finely machined running surfaces 1.14, 2.14 are produced by a lapping process on the inner ring 1.1 and on the outer ring 2.1.
• a sensor 2.2 for example an MR sensor
• an electrical conductor 2.4 here a flexible conductor in the outer ring 2.1 mounted.
• the electrical conductor 2.4 has a rectangular cross-section and therefore has different outer dimensions B, d.
• the thickness d in relation to the width B is relatively low.
• the electrical conductor 2.4 is introduced from the inside of the outer ring 2.1 forth in the third recess 2.13, wherein the larger outer dimension B of the electrical conductor 2.4 is arranged in a direction parallel to the axis A.
• the senor 2.2 and the electrical conductor 2.4 are moved radially outwards until the sensor 2.2 is placed in the third recess 2.13 and the electrical conductor 2.4 projects through the second recess 2.12 into the first recess 2.11. Accordingly, the third recess 2.13 is thus configured so that the sensor 2.2 can be introduced in a direction away from the axis A leading into the recess 2.11.
• the end of the electrical conductor 2.4 is pulled radially outward so that it is outside of the outer ring 2.1. In this position, this end of the electrical conductor 2.4 is then connected to an electrical coupling 2.32 on a circuit board 2.3.
• a circuit board 2.3 On the circuit board 2.3 are several electronic components, including one with an electronic circuit 2.31 for evaluation of signals of the sensor 2.2.
• the first recess 2.1 1 is radially outwardly open, so configured so that the circuit board 2.3 can be inserted in a direction towards the axis A back into the recess 2.1 1. Accordingly, therefore, the circuit board 2.3 is inserted into the first recess 2.11 and is then fixed in the first recess 2.1 1. In this case, the circuit board 2.3 is oriented so that it is aligned parallel to the axis A, so the plane of the circuit board 2.3 is parallel to the axis A.
• a dividing ring 1.2 is mounted on the outer circumference of the inner ring 1.1.
• This dividing ring 1.2 consists of a hard magnetic material, here an iron-cobalt-chromium alloy with a coercive field strength of about 38 kA / m.
• the dividing ring 1.2 has no angle scaling 2.11 or no graduation pattern in this phase.
• the printed circuit board 2.3 is surrounded by the electronic circuit 2.31 in the first recess 2.11 by the solid outer ring 2.1, an optimal protection against electromagnetic interference is given.
• the same also applies to the electrical conductor 2.4 in the second recess 2.12 and for the sensor 2.2 in the third recess 2.13.
• a precise gap between the outer ring 2.1 and the inner ring 1.1 is achieved by the precise production of the outer ring 2.1, the rolling elements 3 and the inner ring 1.1, which has a positive effect on the electromagnetic interference susceptibility.
• the first recess 2.1 1 can be closed on the outside with a lid, in particular with a metal lid.
• first recess 2.1 1 and possibly also the second and third recess 2.12, 2.13 can be filled with a suitable potting material.
• a cable outlet can be realized, for example, through a hole in the cover, for the electrical connection between the angle measuring system and subsequent electronics.
• the unit assembled so far is now attached to a dividing machine.
• the division machine serves to apply an angle scaling 1.21 (FIG. 2) to the graduation ring 1.2.
• the dividing machine comprises a white and a stator block to which a magnetic write head is attached.
• the stator block and the shaft are rotatable relative to each other using an air bearing.
• To divide machine still belongs to a very exact angle measuring device, which serves to precisely determine the angular position of the shaft relative to the stator block.
• the magnetic write head is inserted into the opening 2.15.
• the angle scaling 1.21 consisting of a plurality of magnetic (not visible) graduation marks, applied directly to the shell side of the dividing ring 1.2.
• gradually generated by appropriate energization of the write head on the shell side to the axis A substantially parallel graduation lines as angle scaling 1.21, with alternating north and south poles along the circumference.
• Each division line is radially polarized.
• the distance between the centers of the graduation lines in the circumferential direction is 200 ⁇ m.
• the dividing ring 1.2 controlled by the angle measuring device of the dividing machine, is pivoted further about the axis A.
• the arrangement naturally still deviates from its ideal geometry.
• concentricity deviations lead to circumferentially different geometrical patterns of the angular scaling 1.21 because the angular scaling 1.21 is applied to the graduation ring 1.2 in a mounting situation that corresponds to the final bearing and also the assembly is radially and axially prestressed.
• z due to the mentioned concentricity deviations, z.
• the geometric pattern of the angular scaling 1.21 in the range U1 of the pattern in the range U2 deviate, depending on the local to the respective Exceeding concentricity runout.
• different patterns can be characterized by different pitches of the graduation lines or by different inclinations of the graduation lines with respect to the axis A. Because of the high degree of precision, these differences in the patterns of individual areas are comparatively small. Nevertheless, they contribute to increasing the measuring accuracy of the angle measuring system.
• the previously preassembled unit consisting of the first and the second component group 1, 2, can be dismantled by the dividing machine.
• the measurement result is improved on the one hand because of the minimum gap between the outer ring 2.1 and the inner ring 1.1, on the other hand, thereby a small and always constant sensing distance between the sensor 2.2 and the dividing ring 1.2 can be realized, so that a increased signal quality is achievable. It is only through these measures that it is possible to read out, with high resolution, magnetic angle scales 1.21 which have distances between the centers of the graduation lines in the circumferential direction of less than 300 ⁇ m, in particular less than 250 ⁇ m or less than 200 ⁇ m.
• a significant contribution to achieving the high mechanical rigidity of the angle measuring system provides the special configuration of the recesses 2.11, 2.12, 2.13 and the opening 2.15, as shown in Figures 4a and 4b.
• the opening was 2.15 dimensioned so that their expansion z is relatively small compared to the axial extent Z of the outer ring 2.1.
• the first and second recesses 2.11, 2.12 are designed such that their respective expansions in the circumferential direction U, u are smaller than their axial expansions H, h, that is, U ⁇ H, u ⁇ h.
• the first recess 2.11 of the outer ring has its greatest extent H in a direction parallel to the axis A.
• the outer ring 2.1 is dimensioned such that the extent H of the first recess 2.1 1 is greater than the extent h of the second Recess 2.12 (H> h), each with respect to a direction parallel to the axis A. Furthermore, the extension U of the first recess 2.11 is greater than the extension u of the second recess 2.12 (U> u), each with respect to the circumferential direction.
• the angle measuring system represents a self-contained unit that can be easily mounted by the user on a shaft to be measured but provides extremely exact angular positions. Due to the extremely precise design of the angle measuring system can be dispensed with a compensating coupling.
• the sensor 2.2 supplies position-dependent currents or voltages corresponding to the pole of the angular scaling 1.21 lying opposite the sensor 2.2. These currents or voltages are processed in the electronic circuit 2.31 and finally digitized. The digital signals can then be forwarded by the angle measuring system to a subsequent electronics, whereby a largely interference-free data transmission is made possible by the digitization.
• the angle measuring system is also very compact in its external dimensions and in particular has a very small maximum axial extent Z.
• the axial extent Z is only about 25% of the maximum outer radius.
• the presented construction creates a high-quality angle measuring system, which is suitable for large diameters of the waves to be measured.
• the angle measuring system presented here has a corresponding opening whose inner radius makes up about 66% of the maximum outer radius.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
• Length Measuring Devices With Unspecified Measuring Means (AREA)

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Applications Claiming Priority (2)

Publications (2)

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• 2008
  • 2008-03-10 DE DE102008013377A patent/DE102008013377A1/de not_active Withdrawn
• 2009
  • 2009-01-28 CN CN200980108330XA patent/CN101965519B/zh active Active
  • 2009-01-28 EP EP09719133.2A patent/EP2255207B1/de active Active
  • 2009-01-28 WO PCT/EP2009/050935 patent/WO2009112303A2/de not_active Ceased
  • 2009-01-28 JP JP2010550101A patent/JP5406860B2/ja active Active
  • 2009-01-28 US US12/921,539 patent/US8664944B2/en active Active

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